How do we determine the number of electrons an element

- How do we determine the number of electrons an element has
- How do you determine the number of valence electrons an element has
- How do you determine the number of electrons in an element
- How to determine the number of electrons in an element
- How do you determine the number of valence electrons in an element
- How can you determine the number of electrons in an element
- How to determine number of valence electrons
- How to find the number of valence electrons
- How to find number of valence electrons from electron configuration